When used as a noun, it is one word.
London has many historic landmarks.
When used as a verb, it is two words.
The sailor's discovery of land marks the end of his voyage.
one of the landmarks are the Great Wall
the amber museum is one of the landmarks
It is used as one word.
no it is not an one word it is of two word
Hipbone is one word.
I think the word "ongoing" is only one word, but it has two syllables that are two separate words.
The word "hairbrush" is typically written as one word, not two.
one of the famous Austrian landmarks is the Danube river
One of Whistler's landmarks is Blackcomb, and then there is also Whistler Mountain.
One word, two syllables
It is one word.
one word